fischer



Pa'tented Sept. I3, i898.

J. M. FISCHER, BAKER'S OVEN.

gApplication led Nov. 3, 1897.)

No. 6l0,648. Patented Sept. I3, |898. J. M. FISCHER.

BAKERS OVEN.

(Appiicazion ined Nov. a, 1897 (N0 Modal.)

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N0. 6|O,648. Patented Sept. I3, i898.

J. M. FISCHER. v A BAKERS OVEN.

(Application filed Nov. 3, 1897.;

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JOHN MJFISCHER, VOF WASHINGTON, DISTRICT OFVQOLUMBIA.

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SPECIFICATION forming part of" Letters Patent No. 610,648, dated September 13, 1898. Application led November 3, 1897. Serial No. 657,259. (No model.)

To a/ZZ whom, t may concern: Y

Be it known that I, JOHN M. FISCHER, a citizen of the United States, residing at Washington, in the District of Columbia,have invented certain new and useful Improvements in Bakers Ovens; and I do declare the following to be a full,"clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specilication.

My invention relates to bakers ovens 5 and its Objectis to provide an improved construction of the same which shall possess superior advantages with respect to eliciency in use.

The invention consists in the novel construction and combination of' parts hereinafter fully described and claimed.

In the accompanying drawings, Figure l is a longitudinal sectional View of an oven constructed in accordance with my invention on the line a d, Fig. 3. tion of the same. Fig. 3 is a transverse section on the line b b, Fig. 1. Figs. 4, 5, and 6 are horizontal'sections on the lines c c, d d, and c e, respectively, Fig. 1.

In the said drawings the reference-numeral 1 designates a rectangular brick casing or the walls of the oven, provided at one corner with an ash-pit 2 and a grate 3. Also formed in said casing is a combustion-chamber 4, the top of which consists of a horizontal plate 5, of metal or other suitable material. A Above this plate is the oven-Hoor 6, forming an oven 7, the space between said plate and floor being iilled with sand. rlhe top of the oven consists of a horizontal metal plate 8, upon which is placed a layer of sand an inch or so in depth. Above this oven-top is a horizontal plate 9, forming a chamber l0. (See Fig. 1.)

Communicating with the combustion-chamber, near the lower front end, is a vertical flue 12, extending up through the side wall of the casing into the chamber above the oven and extending inwardly to near the center of said chamber. At the opposite side of said chamber is an upwardly-extending ue 13, which communicates with a tortuous flue 14, located in a chamber 10n in the chamber 10. (See Figs. 3 and 5.) This iiue 14 communi- Fig. 2 is a front eleva! cates with the flue 13 at the front end at one side, and iue 13 then extends rearwardly, forming passage 15, then transversely, forming passage 16, then forwardly and transversely, forming passages 1 7 and 18, and then rearwardly again, forming a central passage 19. This passageelQ communicates with return-passages 20, 21, 22, 23, 24, 25, and 26, located above said first-named passages, and passage 26 communicates at its rear end with the smoke-flue or chimney. The arrows in the several figures show the course of the products of combustion from the combustionchamber to the smoke or escape flue. The said tortuous flue is preferably made of terra cotta, and the spaces between the different passages is packed with sand.

The numeral 27 designates removable caps for allowing access to be had to the different iiues or passages to enable them to be cleaned.

The numeral 2S designates the door for the combustion-chamber, 29 the oven-door, and 30 the place to receive a light, so that the interior of the oven can be inspected. The ap paratus is provided with suitable dampers at such points as are desirable. The combus tion-chamber, as before stated, is provided with a grate for burning coal; but gasolene or other liquid or fluid may be used, if desired.

An oven constructed in accordance with my invention will be found very efficient in use. The oven proper in which the articles to be baked are placed has the heat evenly and uniformly distributed throughout its extent, so that all the articles contained therein are subjected to the same temperature, thus in suring proper baking.

The object of the tortuous liues or passages at the top of the casing is to retard the draft, or rather to present an extended area to the products of combustion, so that the sand in said chamber will be thoroughly heated, thus causing a uniform temperature to be kept up in the chamber above the oven, and consequently a uniform temperature to be maintained in the oven.

Having thus fully described my invention, what I claim is- In a bakers oven, the combination with the casing, of the combustion-chamber, the chamber located above the same iilled with sand, the oven, the chamber above the oven IOO with and'loeated in the chamber at the top of 1o the easing and embedded in sand, substantially as described.

In testimony whereof I affix my signature in presence of tWo Witnesses.

JOHN M. FISCHER.

Witnesses: l

WATSON J NEWTON, EMMA M. GILLETT. 

